Consider a cube of material of edge length 1 (initial volume is 1) loaded uniaxially by a stress o = 150 MPa. Young's modulus is E = 70 GPa, Poisson's ration is v = 0.3 and the yield stress is oy= 70 MPa. Compute the total volume change at o= 150 MPa. Note that the applied stress state is above the yield point.

Coiled springs ought to be very strong and stiff. si3n4 is a strong, stiff material. would you select this material for a spring? explain.

Determine whether or not it is possible to compress air adiabatically from k to 140 kpa and 400 k. what is the entropy change during this process?

Ajournal bearing has a journal diameter of 3.250 in with a unilateral tolerance of 20.003 in. the bushing bore has a diameter of 3.256 in and a unilateral tolerance of 0.004 in. the bushing is 2.8 in long and supports a 700-lbf load. the journal speed is 900 rev/min. find the minimum oil film thickness and the maximum film pressure for both sae 20 and sae 20w-30 lubricants, for the tightest assembly if the operating film temperature is 160°f. a computer code is appropriate for solving this problem.